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@Gordon
That's really strange - part of me wonders whether it had always been like that. The copper is under the while solder resist layer, so if that white layer isn't broken I guess the only possibility is that it got too hot and lifted, unless it was actually like that already :(
That bit is the NFC coil though, so even if it was something that you broke while soldering, all it should do is stop NFC from working, but the rest of the Puck should be ok - it may be a red herring.
Can you check for shorts between the GND and 3V pins with a multimeter? And maybe check the voltage across them when you have a battery plugged in?